//---------------------------------------------------------------------------//
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// Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@gmail.com>
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//
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// Distributed under the Boost Software License, Version 1.0
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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//
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// See http://boostorg.github.com/compute for more information.
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//---------------------------------------------------------------------------//
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#ifndef BOOST_COMPUTE_ALGORITHM_COPY_IF_HPP
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#define BOOST_COMPUTE_ALGORITHM_COPY_IF_HPP
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#include <boost/static_assert.hpp>
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#include <boost/compute/algorithm/transform_if.hpp>
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#include <boost/compute/functional/identity.hpp>
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#include <boost/compute/type_traits/is_device_iterator.hpp>
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namespace boost {
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namespace compute {
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namespace detail {
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// like the copy_if() algorithm but writes the indices of the values for which
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// predicate returns true.
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template<class InputIterator, class OutputIterator, class Predicate>
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inline OutputIterator copy_index_if(InputIterator first,
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InputIterator last,
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OutputIterator result,
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Predicate predicate,
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command_queue &queue = system::default_queue())
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{
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BOOST_STATIC_ASSERT(is_device_iterator<InputIterator>::value);
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BOOST_STATIC_ASSERT(is_device_iterator<OutputIterator>::value);
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typedef typename std::iterator_traits<InputIterator>::value_type T;
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return detail::transform_if_impl(
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first, last, result, identity<T>(), predicate, true, queue
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);
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}
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} // end detail namespace
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/// Copies each element in the range [\p first, \p last) for which
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/// \p predicate returns \c true to the range beginning at \p result.
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///
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/// Space complexity: \Omega(2n)
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template<class InputIterator, class OutputIterator, class Predicate>
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inline OutputIterator copy_if(InputIterator first,
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InputIterator last,
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OutputIterator result,
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Predicate predicate,
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command_queue &queue = system::default_queue())
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{
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BOOST_STATIC_ASSERT(is_device_iterator<InputIterator>::value);
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BOOST_STATIC_ASSERT(is_device_iterator<OutputIterator>::value);
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typedef typename std::iterator_traits<InputIterator>::value_type T;
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return ::boost::compute::transform_if(
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first, last, result, identity<T>(), predicate, queue
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);
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}
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} // end compute namespace
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} // end boost namespace
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#endif // BOOST_COMPUTE_ALGORITHM_COPY_IF_HPP
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